Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..244m&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, Apr. 1, 1980, p. 244-254.
Astronomy and Astrophysics
Astrophysics
21
Magnetically Trapped Particles, Particle Acceleration, Solar Corona, Solar Cosmic Rays, Solar Flares, Mean Free Path, Shock Wave Propagation, Solar Heating, Solar Magnetic Field, Solar Protons, Solar Wind, Stochastic Processes
Scientific paper
It is noted that the major apparent difficulty with the 'magnetic bottle' proposed by Schatten and Mullan is that expansion of the closed model might have a severe cooling effect on the cosmic rays trapped inside. The present paper examines this difficulty by applying the equation for stochastic acceleration to an expanding bottle. The scattering centers are taken to be small-scale magnetic inhomogeneities which are present in the corona prior to the flare, and which are set into turbulent motion when a flare induced shock passes by. It is found that acceleration efficiencies can be high enough to offset expansive cooling. It is concluded that the results indicate that the flux of particles which are accelerated to 100 MeV is very sensitive to shock speed if this speed is less than about 1000 km per s.
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